US2903074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Choked reverse circulating sub
Assignee: Individual
•
Filing: 1956-09-25
•
Granted: 1959-09-08
•
Expires: 1976-09-25
Abstract
No abstract record available.
Inventors
- 👤 Gerald E Layton
- 👤 Walter K Arbuckle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:32
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B21/103; E21B34/00; E21B34/06; E21B34/063
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1732791A
Cited
US1873741A
Cited
US1980942A
Cited
US2368419A
Cited
US2287076A
Cited
US2754910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |